It's only very slightly reactive to UV. I didn't think it was at all, because the colour is not like my other uranium glass, being rather more olive green than most. However, while checking the intensity of a couple of other little Stourbridge beauties I got today http://glassgallery.yobunny.org.uk/displayimage.php?pos=-1625 which really 'zing' under UV, I was amazed to notice a very faint glow from this fella (which I call the Ice Cream Cone :roll: :lol: )

The main body - the olive green bit - glows very faintly indeed and the clear and white more so, but still only quite faintly.

Anybody got any ideas where it might be from? And is it really Uranium, or could it be some other chemical which causes the glow? :shock: :?

I still think manganese, having just drawn the curtains and waved my UV light over a load of old non uranium glass. I meant pale green with a hint of orange, not just orange. Colour is a very subjective thing, after all.

We're all mad! Manganese is a fluoresence initiator and the colour of the light emitted seems to depend on what else is present. Uranium, however, fluoresces in its own right regardless of what else is present, hence always the same green, just varying intensity

Didn't manage a good enough pic, need to use the stronger UV light. But what you could do is try your UV light on some old non-uranium glass in the dark and see what colour glow that has, if any. Slightly sun purpled/greyish clear is a good bet for managese but a lot of pre 1950s coloured glass has the manganese glow. You should be able to see what I mean then.